I had to look it up earlier today. Just about as inane as "Silo" (which around here is something the use for silage or corn.)
"selfie" - the smartphone self-portrait.
So if I use a timer on a camera it's not a Selfie or does any Self-Portrait by any means qualify.
Still wondering? Some people use that for Silhouette, and I don't know why. Sillo maybe?